10. which of the following is a linear equation? a. 4x² +9y2 = 25b. 2+ 6 = 15c. 2x-3y=7d. 4x+6 = 30

For this case we have that by definition, a linear equation is of the form:

That is, the largest exponent of the variable is 1.

Then, according to the options given, we have that the correct option is option D, that is:

Option D

answer: 12

step-by-step explanation:

because yes

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,